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Diamond is kinetically stable with respect to graphite because the path for diamond becoming graphite has a larger activation energy barrier that makes the diamond less ready to transition to graphite, so diamond is kinetically stable.
Graphite is thermodynamically more stable than diamond, because it has less total energy. However, the process needed to get from diamond to graphite has a large activation energy (where the "energy barrier" comes from). So, the reaction proceeds so slowly that diamond is said to be stable (kinetically).
005162520 wrote:What do you mean by large activation energy barrier ? If it has a large activation energy barrier does that mean the reaction takes longer ?
Yes, it takes much longer since it is a lot slower (and usually we don't see diamond rings for example turning to graphite)
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